For example, during an acceleration transient period of time during which a demand load is raised, a supercharging pressure is raised before a mechanical compression ratio is lowered and an internal combustion engine falls in a high load state. At this time, there is a possibility that a generation of knocking and an excessive rise in a cylinder inner pressure occur. This possibility is a task to be solved. The internal combustion engine includes: a variable compression ratio mechanism which is capable of modifying the mechanical compression ratio; a turbo charger (2) which supercharges intake air utilizing an exhaust energy; and an exhaust bypass valve (7) which adjusts a supercharging pressure as a supercharging pressure adjustment mechanism. The mechanical compression ratio is detected by a control shaft sensor (34) and the supercharging pressure is limited on a basis of this mechanical compression ratio.

A continuous variable valve duration system may include a camshaft, and a first cam portion including a first cam. The camshaft is inserted in the first cam portion. A relative phase angle of the first cam with respect to the camshaft is variable. The system may further include an inner bracket transmitting rotation of the cam shaft to the first cam portion, a slider housing in which the inner bracket is rotatably inserted and movable along a predetermined first direction, a rocker shaft, a first rocker arm rotatably disposed to the rocker shaft of which a first end contacts with the first cam and of which a second end is connected to a first valve, an upper housing connected with the slider housing and relatively movable with respect to the slider housing along a second direction vertical to the first direction and a control portion selectively moving the upper housing.

A continuous variable valve duration apparatus may include a camshaft, a first and second cam portions, first and inside brackets transmitting rotation of the camshaft to the first and second cam portions respectively, a slider housing of which the first and second inside brackets are rotatably inserted thereto, cam caps of which each cam cap engaging portion is rotatably connected thereto, a connecting bracket connecting the cam caps and of which a guide opening for the guide protruded portion to be inserted thereto for guiding movement of the slider housing is formed thereto, a slider pin rotatably inserted into the first sliding opening and slidably inserted into the camshaft, a cam pin of which a cam opening for the cam to be slidably inserted thereto is formed and rotatably inserted into the second sliding opening and a controller selectively changing a position of the slider housing.

A variable valve timing system includes an exhaust swing arm swung in accordance with rotation of a camshaft, an intake swing arm similarly swung in accordance with the rotation of the camshaft, and a swing shaft swingably supporting the exhaust swing arm and the intake swing arm. In an engine including a plurality of the variable valve timing systems, the adjacent swing shafts are coupled to each other. The engine includes a link mechanism connected to one of the swing shafts, and an actuator for moving the link mechanism. The actuator controls turning angles of all the swing shafts via the link mechanism.

A continuous variable valve duration apparatus may include: a camshaft; first and second cam portions on which a cam is formed respectively, to which the camshaft is inserted and of which relative phase angles with respect to the camshaft are variable; first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively; a slider housing in which the first and second inner brackets are rotatably inserted, and on which a control slot is formed; a cam cap rotatably supporting the first and the second cam portions and to which the slider housing is slidably mounted; a control shaft which is parallel to the camshaft and on which a control rod is eccentrically formed; an eccentric plate rotatably connected to the control rod and rotatably inserted into the control slot; and a control portion selectively rotating the control shaft.

A continuous variable valve duration apparatus may include: a camshaft; first and second cam portions on which a cam is formed respectively; first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively; a slider housing in which the first and the second inner brackets are rotatably inserted; first and second guiding portions formed on the slider housing; a cam cap on which a cam cap guide contacting the second guiding portion is formed; a control shaft parallel to the camshaft; a control rod eccentrically formed on the control shaft; a guide head on which a head guiding portion and a head hole are formed; a control portion selectively rotating the control shaft; and a stopper limiting movement of the guide head. The head guiding portion is connected to the first guiding portion, and the control rod is inserted into the head hole.

For example, during an acceleration transient period of time during which a demand load is raised, a supercharging pressure is raised before a mechanical compression ratio is lowered and an internal combustion engine falls in a high load state. At this time, there is a possibility that a generation of knocking and an excessive rise in a cylinder inner pressure occur. This possibility is a task to be solved. The internal combustion engine includes: a variable compression ratio mechanism which is capable of modifying the mechanical compression ratio; a turbo charger (2) which supercharges intake air utilizing an exhaust energy; and an exhaust bypass valve (7) which adjusts a supercharging pressure as a supercharging pressure adjustment mechanism. The mechanical compression ratio is detected by a control shaft sensor (34) and the supercharging pressure is limited on a basis of this mechanical compression ratio.

A continuous variable valve duration apparatus may include: a camshaft; first and second cam portions on which a cam is formed respectively, to which the camshaft is inserted and of which relative phase angles with respect to the camshaft are variable; first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively; a slider housing unit in which the first and second inner brackets are rotatably inserted and of which a relative positions with respect to the camshaft is variable; a control shaft parallel to the camshaft; a control rod eccentrically formed on the control shaft; a lifter on which a lifter hole and a rotation hole are formed; and a control portion selectively rotating the control shaft so as to controlling a position of the slider housing unit.

A continuous variable valve duration system may include a camshaft, a first cam portion including a first cam, of which the camshaft is inserted therein, an internal bracket transmitting rotation of the camshaft to the first cam portion, a control shaft parallel to the camshaft, a slider housing in which the internal bracket is rotatably inserted, on which a control groove where the control shaft is inserted into is formed, and the slider housing movable vertical to the camshaft, a guider configured for guiding movement of the slider housing, a rocker shaft, a first rocker arm rotatably disposed to the rocker shaft of which a first end portion contacts with the first cam and of which a second end portion is connected to a first valve and a control portion selectively rotating the control shaft for changing a position of the slider housing.

A continuous variable valve duration apparatus may include a camshaft, a first and second cam portions on which a cam is formed respectively, of which the camshaft is inserted thereto and of which relative phase angles with respect to the camshaft are variable, a first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively, a slider housing in which the first and second inner brackets are rotatably inserted, of which a relative position with respect to the camshaft is variable, and on which a control slot is formed, a cam cap rotatably supporting the first and the second cam portions and to which the slider housing is slidably mounted, a control shaft parallel to the camshaft and on which a control rod is eccentrically formed, an eccentric plate rotatably connected to the control rod and rotatably inserted into the control slot, a separation prevention pin disposed to inhibit the eccentric plate from being separated from the slider housing and a control portion selectively rotating the control shaft so as to controlling a position of the slider housing.